Although he's a central striker, he's often used out in wider positions, most frequently on the left side. His electric pace has torn defences to shreds and now he gets a run at Barcelona.

Athletic head to the Catalan capital able to hold their head up high. They have played Barcelona three times this season already, with a 5-2 aggregate balance in their favour.

They destroyed Barcelona at the San Mames in the Spanish Super Cup first leg, winning 4-0, before drawing the away leg 1-1 to win the trophy.

The third game saw Barcelona earn some pride back, with a 1-0 win thanks to Luis Suarez in Bilbao.

Suarez, Neymar and Lionel Messi are all set to play, and all eyes will be on them. That means shouldering the weight may not mean there's as much pressure on Inaki's shoulders as there might have been.

What he has to do is what he does best. Or at least, one of the things. Run.

Athletic will be penned back for large periods of the game. That means that when they can break, the onus will be on him to charge forward, tearing through space to try to punish Barcelona.

That's not because he's incapable of anything else. In fact, he's a skilful, intelligent forward, but it's just the smartest way to hurt the hosts.

And it utilises his superb speed. Although these things are never completely accurate measures of how quick players are when it comes to turning attacks in their favour, he is statistically the fastest player in La Liga.

The Daily Mail's Kieran Gill wrote: "Williams broke the record in Spain last season after being clocked at 22.2 miles per hour during a 1-1 draw with Deportivo in May."

The same report also linked Premier League sides Arsenal and Liverpool with the forward, saying they are interested in activating his "£15.3 million buyout clause in his current contract which expires in 2017."

Anyone who watches Athletic can see how his dynamism would attract English clubs, but he's also cunning enough to make his way in La Liga too.

The 21-year-old has six goals in 13 La Liga starts, more than any other player in the squad, bar Aduriz.